net/8021q/vlan.c

   1 /*
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:
  10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  14  *
  15  *              This program is free software; you can redistribute it and/or
  16  *              modify it under the terms of the GNU General Public License
  17  *              as published by the Free Software Foundation; either version
  18  *              2 of the License, or (at your option) any later version.
  19  */
  20
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/capability.h>
  24 #include <linux/module.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <linux/rculist.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.h>
  34 #include <net/rtnetlink.h>
  35 #include <net/net_namespace.h>
  36 #include <net/netns/generic.h>
  37 #include <linux/uaccess.h>
  38
  39 #include <linux/if_vlan.h>
  40 #include "vlan.h"
  41 #include "vlanproc.h"
  42
  43 #define DRV_VERSION "1.8"
  44
  45 /* Global VLAN variables */
  46
  47 unsigned int vlan_net_id __read_mostly;
  48
  49 const char vlan_fullname[] = "802.1Q VLAN Support";
  50 const char vlan_version[] = DRV_VERSION;
  51
  52 /* End of global variables definitions. */
  53
  54 static int vlan_group_prealloc_vid(struct vlan_group *vg,
  55                                    __be16 vlan_proto, u16 vlan_id)
  56 {
  57         struct net_device **array;
  58         unsigned int pidx, vidx;
  59         unsigned int size;
  60
  61         ASSERT_RTNL();
  62
  63         pidx  = vlan_proto_idx(vlan_proto);
  64         vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
  65         array = vg->vlan_devices_arrays[pidx][vidx];
  66         if (array != NULL)
  67                 return 0;
  68
  69         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
  70         array = kzalloc(size, GFP_KERNEL);
  71         if (array == NULL)
  72                 return -ENOBUFS;
  73
  74         vg->vlan_devices_arrays[pidx][vidx] = array;
  75         return 0;
  76 }
  77
  78 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
  79 {
  80         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  81         struct net_device *real_dev = vlan->real_dev;
  82         struct vlan_info *vlan_info;
  83         struct vlan_group *grp;
  84         u16 vlan_id = vlan->vlan_id;
  85
  86         ASSERT_RTNL();
  87
  88         vlan_info = rtnl_dereference(real_dev->vlan_info);
  89         BUG_ON(!vlan_info);
  90
  91         grp = &vlan_info->grp;
  92
  93         grp->nr_vlan_devs--;
  94
  95         if (vlan->flags & VLAN_FLAG_MVRP)
  96                 vlan_mvrp_request_leave(dev);
  97         if (vlan->flags & VLAN_FLAG_GVRP)
  98                 vlan_gvrp_request_leave(dev);
  99
 100         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
 101
 102         netdev_upper_dev_unlink(real_dev, dev);
 103         /* Because unregister_netdevice_queue() makes sure at least one rcu
 104          * grace period is respected before device freeing,
 105          * we dont need to call synchronize_net() here.
 106          */
 107         unregister_netdevice_queue(dev, head);
 108
 109         if (grp->nr_vlan_devs == 0) {
 110                 vlan_mvrp_uninit_applicant(real_dev);
 111                 vlan_gvrp_uninit_applicant(real_dev);
 112         }
 113
 114         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 115
 116         /* Get rid of the vlan's reference to real_dev */
 117         dev_put(real_dev);
 118 }
 119
 120 int vlan_check_real_dev(struct net_device *real_dev,
 121                         __be16 protocol, u16 vlan_id,
 122                         struct netlink_ext_ack *extack)
 123 {
 124         const char *name = real_dev->name;
 125
 126         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 127                 pr_info("VLANs not supported on %s\n", name);
 128                 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
 129                 return -EOPNOTSUPP;
 130         }
 131
 132         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
 133                 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
 134                 return -EEXIST;
 135         }
 136
 137         return 0;
 138 }
 139
 140 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 141 {
 142         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 143         struct net_device *real_dev = vlan->real_dev;
 144         u16 vlan_id = vlan->vlan_id;
 145         struct vlan_info *vlan_info;
 146         struct vlan_group *grp;
 147         int err;
 148
 149         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
 150         if (err)
 151                 return err;
 152
 153         vlan_info = rtnl_dereference(real_dev->vlan_info);
 154         /* vlan_info should be there now. vlan_vid_add took care of it */
 155         BUG_ON(!vlan_info);
 156
 157         grp = &vlan_info->grp;
 158         if (grp->nr_vlan_devs == 0) {
 159                 err = vlan_gvrp_init_applicant(real_dev);
 160                 if (err < 0)
 161                         goto out_vid_del;
 162                 err = vlan_mvrp_init_applicant(real_dev);
 163                 if (err < 0)
 164                         goto out_uninit_gvrp;
 165         }
 166
 167         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
 168         if (err < 0)
 169                 goto out_uninit_mvrp;
 170
 171         vlan->nest_level = dev_get_nest_level(real_dev) + 1;
 172         err = register_netdevice(dev);
 173         if (err < 0)
 174                 goto out_uninit_mvrp;
 175
 176         err = netdev_upper_dev_link(real_dev, dev, extack);
 177         if (err)
 178                 goto out_unregister_netdev;
 179
 180         /* Account for reference in struct vlan_dev_priv */
 181         dev_hold(real_dev);
 182
 183         netif_stacked_transfer_operstate(real_dev, dev);
 184         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 185
 186         /* So, got the sucker initialized, now lets place
 187          * it into our local structure.
 188          */
 189         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 190         grp->nr_vlan_devs++;
 191
 192         return 0;
 193
 194 out_unregister_netdev:
 195         unregister_netdevice(dev);
 196 out_uninit_mvrp:
 197         if (grp->nr_vlan_devs == 0)
 198                 vlan_mvrp_uninit_applicant(real_dev);
 199 out_uninit_gvrp:
 200         if (grp->nr_vlan_devs == 0)
 201                 vlan_gvrp_uninit_applicant(real_dev);
 202 out_vid_del:
 203         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 204         return err;
 205 }
 206
 207 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 208  *  Returns 0 if the device was created or a negative error code otherwise.
 209  */
 210 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 211 {
 212         struct net_device *new_dev;
 213         struct vlan_dev_priv *vlan;
 214         struct net *net = dev_net(real_dev);
 215         struct vlan_net *vn = net_generic(net, vlan_net_id);
 216         char name[IFNAMSIZ];
 217         int err;
 218
 219         if (vlan_id >= VLAN_VID_MASK)
 220                 return -ERANGE;
 221
 222         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
 223                                   NULL);
 224         if (err < 0)
 225                 return err;
 226
 227         /* Gotta set up the fields for the device. */
 228         switch (vn->name_type) {
 229         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 230                 /* name will look like:  eth1.0005 */
 231                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 232                 break;
 233         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 234                 /* Put our vlan.VID in the name.
 235                  * Name will look like:  vlan5
 236                  */
 237                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 238                 break;
 239         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 240                 /* Put our vlan.VID in the name.
 241                  * Name will look like:  eth0.5
 242                  */
 243                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 244                 break;
 245         case VLAN_NAME_TYPE_PLUS_VID:
 246                 /* Put our vlan.VID in the name.
 247                  * Name will look like:  vlan0005
 248                  */
 249         default:
 250                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 251         }
 252
 253         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
 254                                NET_NAME_UNKNOWN, vlan_setup);
 255
 256         if (new_dev == NULL)
 257                 return -ENOBUFS;
 258
 259         dev_net_set(new_dev, net);
 260         /* need 4 bytes for extra VLAN header info,
 261          * hope the underlying device can handle it.
 262          */
 263         new_dev->mtu = real_dev->mtu;
 264
 265         vlan = vlan_dev_priv(new_dev);
 266         vlan->vlan_proto = htons(ETH_P_8021Q);
 267         vlan->vlan_id = vlan_id;
 268         vlan->real_dev = real_dev;
 269         vlan->dent = NULL;
 270         vlan->flags = VLAN_FLAG_REORDER_HDR;
 271
 272         new_dev->rtnl_link_ops = &vlan_link_ops;
 273         err = register_vlan_dev(new_dev, NULL);
 274         if (err < 0)
 275                 goto out_free_newdev;
 276
 277         return 0;
 278
 279 out_free_newdev:
 280         if (new_dev->reg_state == NETREG_UNINITIALIZED)
 281                 free_netdev(new_dev);
 282         return err;
 283 }
 284
 285 static void vlan_sync_address(struct net_device *dev,
 286                               struct net_device *vlandev)
 287 {
 288         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 289
 290         /* May be called without an actual change */
 291         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 292                 return;
 293
 294         /* vlan continues to inherit address of lower device */
 295         if (vlan_dev_inherit_address(vlandev, dev))
 296                 goto out;
 297
 298         /* vlan address was different from the old address and is equal to
 299          * the new address */
 300         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 301             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 302                 dev_uc_del(dev, vlandev->dev_addr);
 303
 304         /* vlan address was equal to the old address and is different from
 305          * the new address */
 306         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 307             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 308                 dev_uc_add(dev, vlandev->dev_addr);
 309
 310 out:
 311         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 312 }
 313
 314 static void vlan_transfer_features(struct net_device *dev,
 315                                    struct net_device *vlandev)
 316 {
 317         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 318
 319         vlandev->gso_max_size = dev->gso_max_size;
 320         vlandev->gso_max_segs = dev->gso_max_segs;
 321
 322         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
 323                 vlandev->hard_header_len = dev->hard_header_len;
 324         else
 325                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 326
 327 #if IS_ENABLED(CONFIG_FCOE)
 328         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 329 #endif
 330
 331         vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 332         vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 333
 334         netdev_update_features(vlandev);
 335 }
 336
 337 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 338 {
 339         int err = 0;
 340
 341         switch (event) {
 342         case NETDEV_CHANGENAME:
 343                 vlan_proc_rem_dev(dev);
 344                 err = vlan_proc_add_dev(dev);
 345                 break;
 346         case NETDEV_REGISTER:
 347                 err = vlan_proc_add_dev(dev);
 348                 break;
 349         case NETDEV_UNREGISTER:
 350                 vlan_proc_rem_dev(dev);
 351                 break;
 352         }
 353
 354         return err;
 355 }
 356
 357 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 358                              void *ptr)
 359 {
 360         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 361         struct vlan_group *grp;
 362         struct vlan_info *vlan_info;
 363         int i, flgs;
 364         struct net_device *vlandev;
 365         struct vlan_dev_priv *vlan;
 366         bool last = false;
 367         LIST_HEAD(list);
 368         int err;
 369
 370         if (is_vlan_dev(dev)) {
 371                 int err = __vlan_device_event(dev, event);
 372
 373                 if (err)
 374                         return notifier_from_errno(err);
 375         }
 376
 377         if ((event == NETDEV_UP) &&
 378             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 379                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 380                         dev->name);
 381                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 382         }
 383         if (event == NETDEV_DOWN &&
 384             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 385                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 386
 387         vlan_info = rtnl_dereference(dev->vlan_info);
 388         if (!vlan_info)
 389                 goto out;
 390         grp = &vlan_info->grp;
 391
 392         /* It is OK that we do not hold the group lock right now,
 393          * as we run under the RTNL lock.
 394          */
 395
 396         switch (event) {
 397         case NETDEV_CHANGE:
 398                 /* Propagate real device state to vlan devices */
 399                 vlan_group_for_each_dev(grp, i, vlandev)
 400                         netif_stacked_transfer_operstate(dev, vlandev);
 401                 break;
 402
 403         case NETDEV_CHANGEADDR:
 404                 /* Adjust unicast filters on underlying device */
 405                 vlan_group_for_each_dev(grp, i, vlandev) {
 406                         flgs = vlandev->flags;
 407                         if (!(flgs & IFF_UP))
 408                                 continue;
 409
 410                         vlan_sync_address(dev, vlandev);
 411                 }
 412                 break;
 413
 414         case NETDEV_CHANGEMTU:
 415                 vlan_group_for_each_dev(grp, i, vlandev) {
 416                         if (vlandev->mtu <= dev->mtu)
 417                                 continue;
 418
 419                         dev_set_mtu(vlandev, dev->mtu);
 420                 }
 421                 break;
 422
 423         case NETDEV_FEAT_CHANGE:
 424                 /* Propagate device features to underlying device */
 425                 vlan_group_for_each_dev(grp, i, vlandev)
 426                         vlan_transfer_features(dev, vlandev);
 427                 break;
 428
 429         case NETDEV_DOWN: {
 430                 struct net_device *tmp;
 431                 LIST_HEAD(close_list);
 432
 433                 /* Put all VLANs for this dev in the down state too.  */
 434                 vlan_group_for_each_dev(grp, i, vlandev) {
 435                         flgs = vlandev->flags;
 436                         if (!(flgs & IFF_UP))
 437                                 continue;
 438
 439                         vlan = vlan_dev_priv(vlandev);
 440                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 441                                 list_add(&vlandev->close_list, &close_list);
 442                 }
 443
 444                 dev_close_many(&close_list, false);
 445
 446                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 447                         netif_stacked_transfer_operstate(dev, vlandev);
 448                         list_del_init(&vlandev->close_list);
 449                 }
 450                 list_del(&close_list);
 451                 break;
 452         }
 453         case NETDEV_UP:
 454                 /* Put all VLANs for this dev in the up state too.  */
 455                 vlan_group_for_each_dev(grp, i, vlandev) {
 456                         flgs = dev_get_flags(vlandev);
 457                         if (flgs & IFF_UP)
 458                                 continue;
 459
 460                         vlan = vlan_dev_priv(vlandev);
 461                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 462                                 dev_change_flags(vlandev, flgs | IFF_UP);
 463                         netif_stacked_transfer_operstate(dev, vlandev);
 464                 }
 465                 break;
 466
 467         case NETDEV_UNREGISTER:
 468                 /* twiddle thumbs on netns device moves */
 469                 if (dev->reg_state != NETREG_UNREGISTERING)
 470                         break;
 471
 472                 vlan_group_for_each_dev(grp, i, vlandev) {
 473                         /* removal of last vid destroys vlan_info, abort
 474                          * afterwards */
 475                         if (vlan_info->nr_vids == 1)
 476                                 last = true;
 477
 478                         unregister_vlan_dev(vlandev, &list);
 479                         if (last)
 480                                 break;
 481                 }
 482                 unregister_netdevice_many(&list);
 483                 break;
 484
 485         case NETDEV_PRE_TYPE_CHANGE:
 486                 /* Forbid underlaying device to change its type. */
 487                 if (vlan_uses_dev(dev))
 488                         return NOTIFY_BAD;
 489                 break;
 490
 491         case NETDEV_NOTIFY_PEERS:
 492         case NETDEV_BONDING_FAILOVER:
 493         case NETDEV_RESEND_IGMP:
 494                 /* Propagate to vlan devices */
 495                 vlan_group_for_each_dev(grp, i, vlandev)
 496                         call_netdevice_notifiers(event, vlandev);
 497                 break;
 498
 499         case NETDEV_CVLAN_FILTER_PUSH_INFO:
 500                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
 501                 if (err)
 502                         return notifier_from_errno(err);
 503                 break;
 504
 505         case NETDEV_CVLAN_FILTER_DROP_INFO:
 506                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
 507                 break;
 508
 509         case NETDEV_SVLAN_FILTER_PUSH_INFO:
 510                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
 511                 if (err)
 512                         return notifier_from_errno(err);
 513                 break;
 514
 515         case NETDEV_SVLAN_FILTER_DROP_INFO:
 516                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
 517                 break;
 518         }
 519
 520 out:
 521         return NOTIFY_DONE;
 522 }
 523
 524 static struct notifier_block vlan_notifier_block __read_mostly = {
 525         .notifier_call = vlan_device_event,
 526 };
 527
 528 /*
 529  *      VLAN IOCTL handler.
 530  *      o execute requested action or pass command to the device driver
 531  *   arg is really a struct vlan_ioctl_args __user *.
 532  */
 533 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 534 {
 535         int err;
 536         struct vlan_ioctl_args args;
 537         struct net_device *dev = NULL;
 538
 539         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 540                 return -EFAULT;
 541
 542         /* Null terminate this sucker, just in case. */
 543         args.device1[sizeof(args.device1) - 1] = 0;
 544         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 545
 546         rtnl_lock();
 547
 548         switch (args.cmd) {
 549         case SET_VLAN_INGRESS_PRIORITY_CMD:
 550         case SET_VLAN_EGRESS_PRIORITY_CMD:
 551         case SET_VLAN_FLAG_CMD:
 552         case ADD_VLAN_CMD:
 553         case DEL_VLAN_CMD:
 554         case GET_VLAN_REALDEV_NAME_CMD:
 555         case GET_VLAN_VID_CMD:
 556                 err = -ENODEV;
 557                 dev = __dev_get_by_name(net, args.device1);
 558                 if (!dev)
 559                         goto out;
 560
 561                 err = -EINVAL;
 562                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 563                         goto out;
 564         }
 565
 566         switch (args.cmd) {
 567         case SET_VLAN_INGRESS_PRIORITY_CMD:
 568                 err = -EPERM;
 569                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 570                         break;
 571                 vlan_dev_set_ingress_priority(dev,
 572                                               args.u.skb_priority,
 573                                               args.vlan_qos);
 574                 err = 0;
 575                 break;
 576
 577         case SET_VLAN_EGRESS_PRIORITY_CMD:
 578                 err = -EPERM;
 579                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 580                         break;
 581                 err = vlan_dev_set_egress_priority(dev,
 582                                                    args.u.skb_priority,
 583                                                    args.vlan_qos);
 584                 break;
 585
 586         case SET_VLAN_FLAG_CMD:
 587                 err = -EPERM;
 588                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 589                         break;
 590                 err = vlan_dev_change_flags(dev,
 591                                             args.vlan_qos ? args.u.flag : 0,
 592                                             args.u.flag);
 593                 break;
 594
 595         case SET_VLAN_NAME_TYPE_CMD:
 596                 err = -EPERM;
 597                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 598                         break;
 599                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 600                         struct vlan_net *vn;
 601
 602                         vn = net_generic(net, vlan_net_id);
 603                         vn->name_type = args.u.name_type;
 604                         err = 0;
 605                 } else {
 606                         err = -EINVAL;
 607                 }
 608                 break;
 609
 610         case ADD_VLAN_CMD:
 611                 err = -EPERM;
 612                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 613                         break;
 614                 err = register_vlan_device(dev, args.u.VID);
 615                 break;
 616
 617         case DEL_VLAN_CMD:
 618                 err = -EPERM;
 619                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 620                         break;
 621                 unregister_vlan_dev(dev, NULL);
 622                 err = 0;
 623                 break;
 624
 625         case GET_VLAN_REALDEV_NAME_CMD:
 626                 err = 0;
 627                 vlan_dev_get_realdev_name(dev, args.u.device2);
 628                 if (copy_to_user(arg, &args,
 629                                  sizeof(struct vlan_ioctl_args)))
 630                         err = -EFAULT;
 631                 break;
 632
 633         case GET_VLAN_VID_CMD:
 634                 err = 0;
 635                 args.u.VID = vlan_dev_vlan_id(dev);
 636                 if (copy_to_user(arg, &args,
 637                                  sizeof(struct vlan_ioctl_args)))
 638                       err = -EFAULT;
 639                 break;
 640
 641         default:
 642                 err = -EOPNOTSUPP;
 643                 break;
 644         }
 645 out:
 646         rtnl_unlock();
 647         return err;
 648 }
 649
 650 static struct sk_buff *vlan_gro_receive(struct list_head *head,
 651                                         struct sk_buff *skb)
 652 {
 653         const struct packet_offload *ptype;
 654         unsigned int hlen, off_vlan;
 655         struct sk_buff *pp = NULL;
 656         struct vlan_hdr *vhdr;
 657         struct sk_buff *p;
 658         __be16 type;
 659         int flush = 1;
 660
 661         off_vlan = skb_gro_offset(skb);
 662         hlen = off_vlan + sizeof(*vhdr);
 663         vhdr = skb_gro_header_fast(skb, off_vlan);
 664         if (skb_gro_header_hard(skb, hlen)) {
 665                 vhdr = skb_gro_header_slow(skb, hlen, off_vlan);
 666                 if (unlikely(!vhdr))
 667                         goto out;
 668         }
 669
 670         type = vhdr->h_vlan_encapsulated_proto;
 671
 672         rcu_read_lock();
 673         ptype = gro_find_receive_by_type(type);
 674         if (!ptype)
 675                 goto out_unlock;
 676
 677         flush = 0;
 678
 679         list_for_each_entry(p, head, list) {
 680                 struct vlan_hdr *vhdr2;
 681
 682                 if (!NAPI_GRO_CB(p)->same_flow)
 683                         continue;
 684
 685                 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
 686                 if (compare_vlan_header(vhdr, vhdr2))
 687                         NAPI_GRO_CB(p)->same_flow = 0;
 688         }
 689
 690         skb_gro_pull(skb, sizeof(*vhdr));
 691         skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
 692         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 693
 694 out_unlock:
 695         rcu_read_unlock();
 696 out:
 697         skb_gro_flush_final(skb, pp, flush);
 698
 699         return pp;
 700 }
 701
 702 static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
 703 {
 704         struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
 705         __be16 type = vhdr->h_vlan_encapsulated_proto;
 706         struct packet_offload *ptype;
 707         int err = -ENOENT;
 708
 709         rcu_read_lock();
 710         ptype = gro_find_complete_by_type(type);
 711         if (ptype)
 712                 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr));
 713
 714         rcu_read_unlock();
 715         return err;
 716 }
 717
 718 static struct packet_offload vlan_packet_offloads[] __read_mostly = {
 719         {
 720                 .type = cpu_to_be16(ETH_P_8021Q),
 721                 .priority = 10,
 722                 .callbacks = {
 723                         .gro_receive = vlan_gro_receive,
 724                         .gro_complete = vlan_gro_complete,
 725                 },
 726         },
 727         {
 728                 .type = cpu_to_be16(ETH_P_8021AD),
 729                 .priority = 10,
 730                 .callbacks = {
 731                         .gro_receive = vlan_gro_receive,
 732                         .gro_complete = vlan_gro_complete,
 733                 },
 734         },
 735 };
 736
 737 static int __net_init vlan_init_net(struct net *net)
 738 {
 739         struct vlan_net *vn = net_generic(net, vlan_net_id);
 740         int err;
 741
 742         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 743
 744         err = vlan_proc_init(net);
 745
 746         return err;
 747 }
 748
 749 static void __net_exit vlan_exit_net(struct net *net)
 750 {
 751         vlan_proc_cleanup(net);
 752 }
 753
 754 static struct pernet_operations vlan_net_ops = {
 755         .init = vlan_init_net,
 756         .exit = vlan_exit_net,
 757         .id   = &vlan_net_id,
 758         .size = sizeof(struct vlan_net),
 759 };
 760
 761 static int __init vlan_proto_init(void)
 762 {
 763         int err;
 764         unsigned int i;
 765
 766         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 767
 768         err = register_pernet_subsys(&vlan_net_ops);
 769         if (err < 0)
 770                 goto err0;
 771
 772         err = register_netdevice_notifier(&vlan_notifier_block);
 773         if (err < 0)
 774                 goto err2;
 775
 776         err = vlan_gvrp_init();
 777         if (err < 0)
 778                 goto err3;
 779
 780         err = vlan_mvrp_init();
 781         if (err < 0)
 782                 goto err4;
 783
 784         err = vlan_netlink_init();
 785         if (err < 0)
 786                 goto err5;
 787
 788         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
 789                 dev_add_offload(&vlan_packet_offloads[i]);
 790
 791         vlan_ioctl_set(vlan_ioctl_handler);
 792         return 0;
 793
 794 err5:
 795         vlan_mvrp_uninit();
 796 err4:
 797         vlan_gvrp_uninit();
 798 err3:
 799         unregister_netdevice_notifier(&vlan_notifier_block);
 800 err2:
 801         unregister_pernet_subsys(&vlan_net_ops);
 802 err0:
 803         return err;
 804 }
 805
 806 static void __exit vlan_cleanup_module(void)
 807 {
 808         unsigned int i;
 809
 810         vlan_ioctl_set(NULL);
 811
 812         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
 813                 dev_remove_offload(&vlan_packet_offloads[i]);
 814
 815         vlan_netlink_fini();
 816
 817         unregister_netdevice_notifier(&vlan_notifier_block);
 818
 819         unregister_pernet_subsys(&vlan_net_ops);
 820         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 821
 822         vlan_mvrp_uninit();
 823         vlan_gvrp_uninit();
 824 }
 825
 826 module_init(vlan_proto_init);
 827 module_exit(vlan_cleanup_module);
 828
 829 MODULE_LICENSE("GPL");
 830 MODULE_VERSION(DRV_VERSION);